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// Scintilla source code edit control
/** @file LexMaxima.cxx
** Lexer for Maxima (http://maxima.sourceforge.net).
** Written by Gunter Königsmann based on the lisp lexer by Alexey Yutkin and Neil Hodgson .
**/
// Copyright 2018 by Gunter Königsmann <wxMaxima@physikbuch.de>
// The License.txt file describes the conditions under which this software may be distributed.
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <stdarg.h>
#include <assert.h>
#include <ctype.h>
#include "ILexer.h"
#include "Scintilla.h"
#include "SciLexer.h"
#include "WordList.h"
#include "LexAccessor.h"
#include "Accessor.h"
#include "StyleContext.h"
#include "CharacterSet.h"
#include "LexerModule.h"
using namespace Scintilla;
static inline bool isMaximaoperator(char ch) {
return (ch == '\'' || ch == '`' || ch == '(' ||
ch == ')' || ch == '[' || ch == ']' ||
ch == '{' || ch == '}' || ch == '!' ||
ch == '*' || ch == '/' || ch == '^' ||
ch == ',' || ch == ':' || ch == '+' ||
ch == '-');
}
static void ColouriseMaximaDoc(Sci_PositionU startPos, Sci_Position length, int lastStyle,
WordList *[],
Accessor &styler) {
styler.StartAt(startPos);
Sci_PositionU lengthDoc = startPos + length;
styler.StartSegment(startPos);
Sci_PositionU i = startPos;
// If we are in the middle of a comment we go back to its start before highlighting
if(lastStyle == SCE_MAXIMA_COMMENT)
{
while((i>0) &&
!((styler.SafeGetCharAt(i+1) == '*') && (styler.SafeGetCharAt(i) == '/')))
i--;
}
for (; i < lengthDoc; i++) {
char ch = styler.SafeGetCharAt(i);
char chNext = styler.SafeGetCharAt(i + 1);
if (styler.IsLeadByte(ch))
continue;
// Handle comments.
// Comments start with /* and end with */
if((ch == '/') && (chNext == '*'))
{
i++;i++;
chNext = styler.SafeGetCharAt(i);
for (; i < lengthDoc; i++)
{
ch = chNext;
chNext = styler.SafeGetCharAt(i + 1);
if((ch == '*') && (chNext == '/'))
{
i++;
i++;
break;
}
}
if(i > lengthDoc)
i = lengthDoc;
i--;
styler.ColourTo(i, SCE_MAXIMA_COMMENT);
continue;
}
// Handle Operators
if(isMaximaoperator(ch))
{
styler.ColourTo(i, SCE_MAXIMA_OPERATOR);
continue;
}
// Handle command endings.
if((ch == '$') || (ch == ';'))
{
styler.ColourTo(i, SCE_MAXIMA_COMMANDENDING);
continue;
}
// Handle numbers. Numbers always begin with a digit.
if(IsASCII(ch) && isdigit(ch))
{
i++;
for (; i < lengthDoc; i++)
{
ch = chNext;
chNext = styler.SafeGetCharAt(i + 1);
if(ch == '.')
continue;
// A "e" or similar can be followed by a "+" or a "-"
if(((ch == 'e') || (ch == 'b') || (ch == 'g') || (ch == 'f')) &&
((chNext == '+') || (chNext == '-')))
{
i++;
chNext = styler.SafeGetCharAt(i + 1);
continue;
}
if(!IsASCII(ch) || !(isdigit(ch) || islower(ch) || isupper(ch)))
{
i--;
break;
}
}
styler.ColourTo(i, SCE_MAXIMA_NUMBER);
continue;
}
// Handle strings
if(ch == '\"')
{
i++;
for (; i < lengthDoc; i++)
{
ch = chNext;
chNext = styler.SafeGetCharAt(i + 1);
if(ch == '\\')
i++;
else
{
if(ch == '\"')
break;
}
}
styler.ColourTo(i, SCE_MAXIMA_STRING);
continue;
}
// Handle keywords. Maxima treats Non-ASCII chars as ordinary letters.
if(((!IsASCII(ch))) || isalpha(ch) || (ch == '_'))
{
char cmd[100];
int cmdidx = 0;
memset(cmd,0,100);
cmd[cmdidx++] = ch;
i++;
for (; i < lengthDoc; i++)
{
ch = chNext;
chNext = styler.SafeGetCharAt(i + 1);
if(ch == '\\')
{
if(cmdidx < 99)
cmd[cmdidx++] = ch;
i++;
if(cmdidx < 99)
cmd[cmdidx++] = ch;
continue;
}
if(isMaximaoperator(ch) || ((IsASCII(ch) && !isalpha(ch) && !isdigit(ch) && (ch != '_'))))
{
i--;
break;
}
if(cmdidx < 99)
cmd[cmdidx++] = ch;
}
// A few known keywords
if(
(strncmp(cmd,"if",99) == 0) ||
(strncmp(cmd,"then",99) == 0) ||
(strncmp(cmd,"else",99) == 0) ||
(strncmp(cmd,"thru",99) == 0) ||
(strncmp(cmd,"for",99) == 0) ||
(strncmp(cmd,"while",99) == 0) ||
(strncmp(cmd,"do",99) == 0)
)
{
styler.ColourTo(i, SCE_MAXIMA_COMMAND);
continue;
}
// All other keywords are functions if they are followed
// by an opening parenthesis
char nextNonwhitespace = ' ';
for (Sci_PositionU o = i + 1; o < lengthDoc; o++)
{
nextNonwhitespace = styler.SafeGetCharAt(o);
if(!IsASCII(nextNonwhitespace) || !isspacechar(nextNonwhitespace))
break;
}
if(nextNonwhitespace == '(')
{
styler.ColourTo(i, SCE_MAXIMA_COMMAND);
}
else
{
styler.ColourTo(i, SCE_MAXIMA_VARIABLE);
}
continue;
}
styler.ColourTo(i-1, SCE_MAXIMA_UNKNOWN);
}
}
LexerModule lmMaxima(SCLEX_MAXIMA, ColouriseMaximaDoc, "maxima", 0, 0);
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